1HZ rebuild (1 Viewer)

[lynchmob]

I bought this engine last fall as a core that might run just fine. Well, it probably did run when I got it. I had it stored poorly and it froze up

I was going to tear it apart anyway so no big deal. I dismantled most of it this weekend - pics below and to follow.

 

[lynchmob]

More pics - first pic shows the one piston that is really stuck. Third one shows the extent of some of the external rust. I think the clutch disk and cover are actually new. This was a mine truck engine and I believe it was used in a salt mine.

 

[lynchmob]

Last pics for now. The front cover is really hosed. Salt got in the pocket behind the back half and just ate away at it. Ill need a new cover if someone has one let me know.

 

[lynchmob]

Is it standard practice to replace the precups if you have the head off?

They look fine, but Im sure this engine had a hard life. The main and rod bearings dont show much wear, though one rod an one main do show some scratches .

 

[mac]

Those covers are $$$ because they contain the drive rotor for the oil pump- which, by the way, is something to look very closely at before reassembly. I had to replace mine as there was too much end to end play in the shaft and the rotor was striking the block. There are some guys local here(BC) that are importing parts and can bring one of those covers in. I picked mine up used from a local Cruiserhead- Mike McT but I'm not sure if he has another. He might as he had 3-4 of these engines kicking around.

As for precups- I can't help you really but if it was me, I'd be changing them.

How about a nice 1HDT block with the turbo oil return in the side while you've got it all apart- I've got one sitting here.

 

[lynchmob]

Those covers are $$$ because they contain the drive rotor for the oil pump- which, by the way, is something to look very closely at before reassembly. I had to replace mine as there was too much end to end play in the shaft and the rotor was striking the block. There are some guys local here(BC) that are importing parts and can bring one of those covers in. I picked mine up used from a local Cruiserhead- Mike McT but I'm not sure if he has another. He might as he had 3-4 of these engines kicking around.

As for precups- I can't help you really but if it was me, I'd be changing them.

How about a nice 1HDT block with the turbo oil return in the side while you've got it all apart- I've got one sitting here.

Yeah I know about the $$. I havent gotten a rebuild kit yet so Im going to check with some of the suppliers in AU to see if they have anything used to offer. Mike never seems to visit mud, but Ill give it a shot.

thanks

 

[lynchmob]

Hi All,

I have found these possible sources for rebuild kit.

Anything good or bad to say about them regarding price or parts? Do they all sell the same parts?
engine australia
gw engine parts
roodogs
diesel spares

I have found comments here and there on the forum, but not much regarding the 1HZ kit pricing or parts quality.

Looking at the PDF manual I dont see any reference to a requirement that the head bolts (or any other stress bolts) need to be replaced unconditionally. There are steps to check all the bolts for stress or damage which leads me to believe they are reusable. If you have bought a kit for one of these engines, did it come with any of the bolts (head, rod, or main)? The pdf manual is a pain and I may have missed it.

 

[BlueHZT60]

ENS Toyota up in Canada. I believe you want to avoid the southern hemisphere bottom end bearings.

AND - please keep track of your rebuild, my 2nd HZ drivetrain (in Bend) is getting much closer to being re-built for my 45. Bob

 

[mac]

Hi All,

I have found these possible sources for rebuild kit.

Anything good or bad to say about them regarding price or parts? Do they all sell the same parts?
engine australia
gw engine parts
roodogs
diesel spares

I have found comments here and there on the forum, but not much regarding the 1HZ kit pricing or parts quality.

Looking at the PDF manual I dont see any reference to a requirement that the head bolts (or any other stress bolts) need to be replaced unconditionally. There are steps to check all the bolts for stress or damage which leads me to believe they are reusable. If you have bought a kit for one of these engines, did it come with any of the bolts (head, rod, or main)? The pdf manual is a pain and I may have missed it.

I've dealt with Roodogs and they are great. As for the head bolts- I would swap them. I put new ones in when I did up my engine. In fact, I don't like to re-use any torque-to-yield bolts. Same goes for the rods. It would suck to have a preventable failure after working so hard and spending so much coin to put one of these beauties together.

 

[lynchmob]

So far I have found that all the AU kits do come with head bolts. Cheapest so far is engine australia at 780 AUD.

BlueHZ - do you have any reference info to support your comments on the bearings? Ive not heard that before.

 

[60/40GUY]

I have ordered parts from 4WDSystems.comau and have had good luck. They were able to provide new, used and aftermarket parts. I stopped in at the Adelaide store and talked with the owner Tom. He seemed very knowladgable and had lots of experience. The web site is not up to date and I have found that it is best to call them direcly with questions.

Keep up the posts. I need the inspiration. I'm still working on my 1HZ & turbo. Then I have to put it in the 60.

Frank

 

[mac]

So far I have found that all the AU kits do come with head bolts. Cheapest so far is engine australia at 780 AUD.

BlueHZ - do you have any reference info to support your comments on the bearings? Ive not heard that before.

ACL's seem to be the bearing of choice by "those in the know".

 

[lynchmob]

Arent the ACL bearings from AU?

 

[mac]

Yup, I believe so.

 

[lynchmob]

Yeah I thought so - hence the question regarding the comment about southern hemi bearings made by BlueHZ.

I certainly have read about the problem with HD rod bearings, but the general consensus from others seems to be that this issue was not present in the HZ. I wonder why since the big end is the same. One would think that the higher compression HZ would experience similar bearing pressures as a turbo HD. Info is probably posted somewhere- I just havent read it...

 

[BlueHZT60]

Bottom end - talk to G&S or to Wayne. I bet if you did a quick search here something would pop up. IIRC the southern ones use a softer metal (alum?) that wears much faster, especially if you add a turbo. Bob

 

[roscoFJ73]

Bottom end - talk to G&S or to Wayne. I bet if you did a quick search here something would pop up. IIRC the southern ones use a softer metal (alum?) that wears much faster, especially if you add a turbo. Bob

Show us the proof. You keep mentioning "southern" Havent you got the balls to say "aussie" or do you mean Alabama?

I seem to recall everyone was using ACL a while back because their bearings were harder than Toyotas. They are also OEM for GM and Ford in oz and there are no complaints.
Some Toyota dealers in oz were quietly using ACL bearings at one stage to remedy the problem because they felt they couldnt trust the OEM.(read the old LCML archives)


The 1HZ bottom end lasts longer on average because it has less HP.It does have a higher compression than a factory turbo but this is negated by the fact that the turbo is ramming air into its combustion chamber and thus increasing the pressure on the bearings.

If you add a turbo and drive them hard ,the big ends will delaminate just like the 1HD T

The mining industry here gobbles up 1HZ engines at a frantic pace and they are usually rebuilt with ACL kits.
Some of the larger mines have 150+ 75/79 series.
They wouldnt keep using ACL if they were duds

 

[watrob]

There's nothing wrong with ACL bearings. Australia with 22mil people would have more diesel motors running around than the 360mil in the States. Now the take up of diesel engines in the State's is picking up so that will certainetly may now of changed.

The BMW X5 diesel has been sold in Aussie since 1999, the State's is still yet to see one and it's built in the State's.

Australia per head of population has one of the highest take ups of 4x4 in the world.

The way things are going here in 10 years time we will be droping the 6 cylinder BMW diesel into our FJ's, 200kw, twin turbo, 600nm torque and 38 miles to the gallon.

 

[lynchmob]

Thanks for the info on the bearings. Ill have to ask who supplies the bearings for the kits I have been quoted

 

[lynchmob]

HZ vs HD injector pump

Are the HZ and HD Injection pumps basically the same pumps tuned to work with each engine? Could an HZ pump be used on an HD engine if it was tuned up or would it need parts replaced?